/**
 * Copyright (C) 2002-2015   The FreeCol Team
 * <p>
 * This file is part of FreeCol.
 * <p>
 * FreeCol is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 * <p>
 * FreeCol is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * <p>
 * You should have received a copy of the GNU General Public License
 * along with FreeCol.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.sf.freecol.server.generator;

import java.io.File;
import java.util.HashMap;

import net.sf.freecol.common.io.FreeColSavegameFile;
import net.sf.freecol.common.model.Game;
import net.sf.freecol.common.model.IndianSettlement;
import net.sf.freecol.common.model.Map;
import net.sf.freecol.common.model.Map.Layer;
import net.sf.freecol.common.model.Nation;
import net.sf.freecol.common.model.Player;
import net.sf.freecol.common.model.Region;
import net.sf.freecol.common.model.Tile;
import net.sf.freecol.common.model.TileItemContainer;
import net.sf.freecol.common.model.TileType;
import net.sf.freecol.server.FreeColServer;
import net.sf.freecol.server.model.ServerGame;
import net.sf.freecol.server.model.ServerIndianSettlement;
import net.sf.freecol.server.model.ServerPlayer;
import net.sf.freecol.server.model.ServerRegion;


/**
 * Load a map.
 */
public class FreeColMapLoader implements MapLoader
{

    private final ServerGame importGame;

    public FreeColMapLoader( File file ) throws Exception
    {
        importGame = FreeColServer.readGame( new FreeColSavegameFile( file ), null, null );
    }


    @Override
    public Layer loadMap( Game game, Layer layer )
    {
        Map importMap = importGame.getMap( );
        Layer highestLayer = layer.compareTo( importMap.getLayer( ) ) < 0
                ? layer : importMap.getLayer( );
        int width = importMap.getWidth( );
        int height = importMap.getHeight( );

        java.util.Map< String, ServerRegion > regions = new HashMap<>( );

        Map map = new Map( game, width, height );
        if ( highestLayer == Layer.LAND )
        {
            // import only the land / water distinction
            for ( int x = 0; x < width; x++ )
            {
                for ( int y = 0; y < height; y++ )
                {
                    Tile t = new Tile( game,
                                       ( importMap.getTile( x, y ).getType( ).isWater( ) )
                                               ? TileType.WATER : TileType.LAND,
                                       x, y );
                    map.setTile( t, x, y );
                }
            }
        }
        else
        {
            for ( int x = 0; x < width; x++ )
            {
                for ( int y = 0; y < height; y++ )
                {
                    Tile template = importMap.getTile( x, y );
                    Tile tile = new Tile( game, null, x, y );
                    map.setTile( tile, x, y );

                    // import tile types
                    tile.setType( game.getSpecification( ).getTileType( template.getType( ).getId( ) ) );
                    tile.setMoveToEurope( template.getMoveToEurope( ) );
                    if ( highestLayer.compareTo( Layer.REGIONS ) >= 0 )
                    {
                        // import regions
                        Region region = template.getRegion( );
                        if ( region != null )
                        {
                            ServerRegion ours = regions.get( region.getId( ) );
                            if ( ours == null )
                            {
                                ours = new ServerRegion( game, region );
                                regions.put( region.getId( ), ours );
                            }
                            tile.setRegion( ours );
                            ours.addTile( tile );
                        }
                        if ( highestLayer.compareTo( Layer.RIVERS ) >= 0 )
                        {
                            // import tile improvements
                            tile.setTileItemContainer( new TileItemContainer( game, tile, template
                                    .getTileItemContainer( ), layer ) );
                            if ( layer.compareTo( Layer.NATIVES ) >= 0 )
                            {
                                // import native settlements
                                if ( template.getOwner( ) != null )
                                {
                                    String nationId = template.getOwner( ).getNationId( );
                                    Player player = game.getPlayerByNationId( nationId );
                                    if ( player == null )
                                    {
                                        Nation nation = game.getSpecification( ).getNation( nationId );
                                        player = new ServerPlayer( game, false, nation, null, null );
                                        game.addPlayer( player );
                                    }
                                    tile.setOwner( player );
                                    if ( template.getOwningSettlement( ) != null )
                                    {
                                        IndianSettlement settlement = ( IndianSettlement ) template.getOwningSettlement( );
                                        tile.setOwningSettlement( new ServerIndianSettlement( game,
                                                                                              player, tile, settlement ) );
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        for ( Region region : regions.values( ) )
        {
            map.addRegion( region );
        }
        map.setLayer( highestLayer );
        game.setMap( map );
        return highestLayer;
    }


    @Override
    public Layer getHighestLayer( )
    {
        return Layer.NATIVES;
    }
}
